Means for cooling vacuum-tubes.



H. F. WAITE. MEANS PoR COOLING VACUUM Tum:AN

APPLICATION FILED SEPT. 22, 1913.

Patented J an. 19, 1915 ifi h l como specification of Letters Patent.

' OFFICE Application led eptember 22, 1913. Serial No. 791,162.

To all 'whom t may concern: .Y A Be it known that I, HARRY F. wenn, a

citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Means` for Cooling Vacuum-Tubes;- and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art lto which it appertains to make and use the same.

I This invention relates to an improved construction of cathodes for X-ray and other high'vacuum tubes, and means for cooling the same, and has for its ob]ect to do away with the annoyances due to the` heating of the present cathodes and the'ad]acent parts of the tube.

'cross sectional detail view' showing the conducting spring members between the air tube and the cathode. v

1 indicates any vacuumtube the cathode or other portion of which it is desired to cool; 2 a metal cathode or other terminal; 3

a metaltube sealed in the cathode 2; 4 a

platinum tube sealed to the metal tube 3;

and 5 the glass of the tube 1 turned up and sealed to the platinum tube 1.

6 represents a metal cap setting over and secured to the negative end of the tube 1 and provided with the opening 7 to which may be attachedthe tube 8-as shown. Passing through the cap 6 is the ymetal tube 9 adapted to be connected at onel end with a source of compressed air by the tube 10, and

' to a source of current by the wire 11 as will irYoV-idedvvith the nipple 15 to which the l e--8 may be connected, and also with the rubber gasket 16 which fits the neck of the tube 1, the air chamber 17 escaping throughthe opening 18. c y The operation of my invention willbe clear from what follows z-Owing to the 'very powerful vacuum tube apparatus now employed, the heating of the cathode and adjacent portions of the tube becomes' a serious obstacle to the eiicient use of the tubes. By my invention, the current has a continuous' metallic connection from the sourceto the electrode being cooled, the compressed air fed through the tube 9 expands at the points most heated and -there'- fore produces a maximum cooling action at the place needed. After escaping from the tube 9 the compressed air preferably passes back to the opening 7 and through the tube 8 into the chamber 17 whence it escapes through the opening 18 and thereby cools the neck of the tube 1 surrounding the cathode, but, ofcourse, the chamber 17 may be independently supplied with compressed air if desired. It is found that the inside resistance ofthe tube remains more constant when both the'neck and cathode are cooled;

than when only one is cooled, and therefore the penetration. of the rays is more satisfactory. In fact by my means of cooling these parts, I am enabled to maintain a vacuum suiiiciently low to accomplish penetrations that would be impossible with uncooled parts, owing tothe great heat that is generated in these said parts.

My invention, of course, is applicable tol other vacuum tubes thanl thoseused in X-ray work. For example, yitis applicable to the so called valve tubeswherein two bulbs'provided with electrodes of different sizes are connected by a restricted passage.

Accordingly, I do not wish `to be limited to the abovedisclosure except as may be required by the claim.

What I claim is In an X-ray tube the combination of a cathode tip; a metal tube connected-'to said tip; a platinum tube connected to said metal Patented aan. 19, `1915.

tube; a glass connection with said platinum v of said negative end; and a connectionbetip; a chamber surrounding" the cathode neck in presence of two Witnesses.

HARRY 1F. WAKTE.

prevenz the escepe of gas from said negative. lu testimony whereof ax my s1'lg1mzz1.',lmre9 tween said cap and chamber by which c001- ing gas after leaving' the'` cathode tip is Wltnesses: caused. to ci-rculatearound said neck, sub- EDWARD J. LEVY,

Istantally as descrbe HENRY GELOBBR. 

